The objective of this study is to show the environmental and operating cost savings that could be achieved if long-range transport aircraft were designed for shorter ranges, and long-range flights were operated with an intermediate stop, obviously, with the drawback of longer trip duration and the increase in the number of flight cycles. The maximum take-off weight and operating empty weight, the main design variables of transport airplanes, noticeably diminish. The overall result depends on the length of the route, the extra distance due to the detour, the location of the intermediate airport and the technology level (range factor and operating empty weight fraction with respect to the maximum take-off weight). In all the routes analysed, the uneven splitting between both legs plays a secondary role. It is shown that long routes are well adapted to intermediate stop operations, particularly when the airliner serving the route has been designed for a medium range. However, intermediate stop operations produce a negative impact for medium and short city pair distances, since the reduction in aircraft weight is more than counterbalanced by the extra fuel and time required in the non-cruise phases of the flights.
AndersonJD. The airplane: a history of its technology, Reston, VA, USA: AIAA, 2002.
2.
Eurocontrol. Long-term forecast of air traffic 2004–2025, Brussels, Belgium: Eurocontrol, 2005.
3.
Airbus. Global market forecast 2011–2030, Blagnac, France: Airbus, 2011.
4.
Boeing Commercial Airplanes. Current market outlook 2011-2030, Seattle, WA, USA: Boeing Commercial Airplanes, 2011.
5.
Martinez-ValRPalacinJFPerezE. The evolution of jet airliners explained through the range equation. Proc IMechE, Part G: J Aerospace Engineering2008; 222: 915–919.
6.
Martinez-ValRPerezE. Aeronautics and astronautics: recent progress and future trends. Proc IMechE, Part C: J Mechanical Engineering Science2009; 223: 2767–2820.
7.
Martinez-ValRPerezEMuñozT. Design constraints in the payload-range diagram of ultrahigh capacity transport airplanes. J Aircr1994; 31: 1268–1272.
8.
Champion C. A380. In: Proceedings of the 26th ICAS congress, Anchorage, AS, USA, 14–19 September 2008. Bonn, Germany: ICAS [CD].
9.
European Council. Meeting society’s needs and wining global leadership. European Aeronautics: A vision for 2020, Report of the Group of Personalities. Brussels, Belgium: European Council, 2001.
10.
Brown N, Burleson C, Holsclaw C, et al. Going green – mitigating aviation’s environmental drivers. In: Proceedings of the 26th ICAS congress, Anchorage, AS, USA, 14–19 September 2008. Bonn, Germany: ICAS [CD].
11.
FilipponeA. Analysis of carbon dioxide emissions from transport aircraft. J Aircr2008; 45: 185–197.
LiebeckRH. Design of the blended-wing-body subsonic transport. J Aircr2004; 41: 10–25.
14.
Torenbeek, E. Blended-wing-body and all wing airliners. In: Proceedings of the 8th European workshop on aircraft design education, Samara, Russia, 30 May to 2 June 2007, accessible at www.aircraftdesign.org (accessed 14 October 2011).
15.
Martinez-ValRPérezEAlfaroP. Conceptual design of a medium size flying wing. Proc IMechE, Part G: J Aerospace Engineering2007; 221(1): 57–66.
16.
Cuerno-RejadoCAlonso–AlbirLGehseP. Conceptual design of a medium-sized joined-wing aircraft. Proc IMechE, Part G: J Aerospace Engineering2010; 224(6): 681–696.
17.
TorenbeekE. Synthesis of subsonic airplane design, Delft, The Netherlands: Delft University Press, 1982.
18.
RoskamJ. Airplane design. Part I: Preliminary sizing of airplanes, Ottawa, KS: Roskam Aviation, 1985.
FilipponeA. Flight performance of fixed and rotary wing aircraft, Amsterdam, The Netherlands: Elsevier, 2006.
22.
Langhans S, Linke F, Nolte P, et al. System analysis for future long-range operation concepts. In: Proceedings of the 27th ICAS congress, Nice, France, 19–24 September 2010. Bonn, Germany: ICAS [CD].
23.
GreenJE. Kuchemann’s weight model as applied in the first Greener by Design Technology Sub Group Report: a correction, adaptation and commentary. Aeronaut J2006; 110(1110): 511–516.
24.
NangiaRK. Efficiency parameters for modern commercial aircraft. Aeronaut J2006; 110(1110): 495–510.
25.
Cremers W and Slingerland R. Impact of intermediate stops on long-range jet-transport design. In: Proceedings of the 7th AIAA Aviation technology, integration and operations conference (ATIO), Belfast, UK, 18–20 September 2007, Paper no. AIAA 2007-7849.
26.
Kenway GKW, Henderson R, Hicken JE, et al. Reducing aviation’s environmental impact through large aircraft for short ranges. In: Proceedings of the 48th AIAA Aerospace sciences meeting, Orlando, FL, 4–7 January 2010. Reston, VA: AIAA, paper no. AIAA 2010-1015, pp.1–11.
27.
Martinez-ValRRoaJPerezE. Effects of the mismatch between design capabilities and actual aircraft utilization. J Aircr2011; in press.
28.
Coutrot A. Key technology enablers for the future of aeronautical equipment industry. In: Proceedings of the 25th ICAS congress, Hamburg, Germany, 3–8 September 2006. Bonn, Germany: ICAS [CD].
29.
RoseroJAOrtegaJAAldabasE. Moving towards a more electric aircraft. IEEE Aerosp Electron Syst Mag2007; 22: 3–9.
30.
TorenbeekE. Cruise performance and range prediction reconsidered. Prog Aerosp Sci1997; 33(5–6): 285–322.
31.
CavcarMCavcarA. Comparison of generalized approximate cruise range solutions for turbojet/fan aircraft. J Aircr2003; 40(5): 891–895.
32.
JacksonP. All the world’s aircraft 1999-2000, Coulsdon, UK: Jane’s Information Group, 1999.
33.
JacksonPMunsonKPeacockL. All the world’s aircraft 2008-2009, Coulsdon, UK: Jane’s Information Group, 2008.
34.
VasighBFlemingKTackerT. Introduction to air transport economics, Aldershot, UK: Ashgate, 2008.
35.
BradleyMDroneyCPaisleyD. Subsonic ultra green aircraft research, SUGAR, Langley, VA, USA: NASA N+3 Workshop. April 2010.
36.
FieldingJP. Introduction to aircraft design, Cambridge, UK: Cambridge University Press, 1999.
37.
ShepherdJENuytCDLeeJJ. Flash point and chemical composition of aviation kerosene (Jet A), Pasadena, CA: Graduate Aeronautical Labs, California Institute of Technology, report no. EDL FM99-4. May 2000.
38.
European Environment Agency. EMEP/CORINAIR emission inventory guidebook, Copenhagen, Denmark: European Environment Agency, 2006.
ScholzDDOCSYS – A method to evaluate aircraft systems. In: SchmittD (eds). Bewertung von Flugzeugen, Workshop DGLR, Fachausschuss S2, Luftfahrtsysteme, Munich. 26–27 October 1998. Bonn: Gesellschaft für Luft- und Raumfahrt.
Martinez-ValRPerezEPuertasJ. Optimization of planform and cruise conditions of a transport flying wing. Proc IMechE, Part G: J Aerospace Engineering2010; 224(G12): 1243–1251.
43.
Trevett J. New versus old. Aircraft economics, July/August 1999, Issue 44, pp.39–41.
44.
Martinez-Val R, Perez E, Cuerno C, et al. Cost-range trade-off in the design and operation of long-range transport airplanes. In: Proceedings of the 27th ICAS congress, Nice, France, 19–24 September 2010. Bonn, Germany: ICAS [CD].
